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Paracryptodira
__NOTOC__ Paracryptodira is an extinct group of reptiles in the clade Testudinata (which contains modern turtles and their extinct relatives), known from the Jurassic to Paleogene of North America and Europe. Initially treated as a suborder sister taxon, sister to Cryptodira,Gaffney (1975) they were then thought to be a very primitive lineage inside the Cryptodira according to the most common use of the latter taxon.Joyce (2007) They are now often regarded as late-diverging stem group, stem-turtles, lying outside the clade formed by Cryptodira and Pleurodira. Paracryptodires are divided into three main groups, Compsemydidae, known from the Late Jurassic to Paleocene of North America and Europe, Pleurosternidae, known from the Late Jurassic to Early Cretaceous of North America and Europe, and Baenidae, known from the Early Cretaceous to Eocene of North America. The latter two groups are more closely related to each other than to ''Compsemys'', forming the clade Baenoidea. Characte ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Compsemydidae
Compsemydidae is an extinct family of Testudinata, turtles, likely belonging to the clade Paracryptodira. The earliest undisputed member is ''Tongemys'' from the Berriasian age of the Early Cretaceous; two Late Jurassic genera (''Riodevemys'' and ''Selenemys'') have also sometimes been included in the group, but may alternatively be members of the family Pleurosternidae. The genus ''Compsemys'' survived the Cretaceous–Paleogene extinction event and lasted until the Thanetian age of the Paleocene. Taxonomy Compsemydidae was named in a 2015 paper by Pérez-García ''et al.'', who included the type genus ''Compsemys'' and its possible synonym ''Berruchelus''. A 2020 paper by Joyce and Rollot expanded the family to include the enigmatic ''Peltochelys'' from the Early Cretaceous, as well as the Late Jurassic ''Riodevemys'' and ''Selenemys'' that had earlier been placed in Pleurosternidae. A 2021 paper by Rollot ''et al.'' added the Late Cretaceous ''Kallokibotion'' to the family, b ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |